Nobody should be surprised at official statistics showing that one in five women over 16 in England and Wales has been the victim of a sexual offence. Just before last week's report was launched and in response to a flurry of post-New Year accounts of harassment, the Everyday Sexism Project invited women to share their experiences of harassment on Twitter using the hashtag #ShoutingBack. Some 3,500 did so within the first five days.

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